Pulp washer or condenser.



PATENTED OCT. 11, 1904.

H. (LTURNER. PULP WASHER AND CONDENSER.

APPLICATION FILED NOV, 13, 1903.

3 SHEETS-SHEET 1.

N0 MODEL.

Wit-moses 8 vwc ntoz 1m 771 92. PATENTED OCT. 11, 1904.

H.G.TURNER.-

PULP WASHER AND CONDENSER.

APPLICATION FILED NOV. 13, 1902.. no MODEL. a SHEETS-SHEET 2.

Witnesses I W f I 5] wuento-z No. 772,192. PATENTED 00111, 1904.v

- H.G.I .URNBR.

I PULP WASHER AND CONDENSER. APPLICATION FILED NOV.'13; 1903.

no MODEL. v s SHEETS-SHEET a.

wit-moon \%w m U IT D STATES Patented October 11, 1904.

PATENT OFFicE.

HORACE GREELEY TURNER, OF MONTREAL, CANADA.

PULP WASHER OR CONDENSER.

SPECIFICATION forming part of Letters Patent No. 772,192, dated October 11, 1904.

Application filed November 13, 1903. Serial No. 181,093. (No model.)

To all whom it may concern:

Be it known that I, HORACE GREELEY TUR- NEB, of the city of Montreal, in the district of Montreal and Province of Quebec, Canada, have invented certain new and useful Improvements in Washers. or Condensers; and I do hereby declare that the following is a full,

clear, and exact description ofthe same.

My invention relates particularly to continuously-operating apparatus for use in washing or condensing pulp or any other granular or fibrous or other finely divided or disintegrated substances; and it has for its object to provide a washer or condenser wherein when the apparatus is used as a'washer the substance will be washed repeatedly througha series of stages, in each of which the water in which the substance is washed is drawn off and the fresh water supplied in variable quantity and wherein the resistance to the substance flowing through each stage is adjusted. The invention may be said, briefly, to consist of a vertical washing-chamber comprising a series of superimposed stages, each of which has a screening-wall through which the Water, after having washed the pulp, is drawn off, while such water drawn off is compensated by fresh water supplied through a valve-controlled inlet. spring actuated, are adapted to keep the washed pulp from adhering to the screeningwall, and such doctors are kept clear of pulp by jets of water, while the resistance to the water flowing through the apparatus, and consequently the depth of water therein and the pressure thereof, is regulated by an outlet adjustable to different levels, and the adjusted depth and pressure are maintained constantly by an automatically-variable discharge-valve. For full comprehension, however, of my invention reference must be had to the accompanying drawings, forming a part of this specification, in which similar reference characters indicate the same parts, and wherein Figure 1 is a side elevation of a pulp-washer constructed according to my invention. Fig. 2 is a longitudinal vertical sectional view thereof, taken on line A A, Fig. 1. Fig. 3 is a horizontal sectional view' taken on line B B, Fig. 2, and with the series of openings in the A series of doctors, preferably horizontal partitions shown in dotted lines;

and Fig. 4 is a horizontal sectional view of the automatically-variable discharge-valve.

A circular tank Z; has a screening member in theform of a cylinder 0 therein, preferably constructed of perforated sheet metal and extending from within a short distance of the bottom thereof to a point within a short dis- ,tance of the top. screening-cylinder has a bottom cl, to which The lower end of this the lower end of the dfiving-shaftais rigidly connected, as at f, and therupper end has a solid head dwith an opening d to prevent a vacuum formingin the interior of the cylinder, while an annular bearing-block g of truncated conical form upon the under side of this bottom rests in a correspondingly-formed annular bearing-seat 9 upon the bottom of the :tank, thereby guiding thelower end of the screening member and centralizing it when it.

is inserted. A flexible shield in the form of an annular apron is fastened to the conical bearing-block g and hangs downwardly over the bearing-seat g and keeps the pulp from leaking through the bearing-faces, but allows the water to pass. A discharge-pipe leads from the bottom of the tank and communicates at its upper end with the interior of the screening-cylinder (through the opening in the-bearing-block and its seat) and at its lower end through a T with one end of a pipe, length 71, the opposite end whereof has a loose-joint elbow it thereon. having the main dischargepipe 1' mounted rigidly in the other end thereof, such discharge-pipe, through the medium of the elbow, being adjustable to diiferentangular positions to vary the height of its discharge end,and consequently adjust the resistance to the substance flowing through the screening-cylinder. The automatically-variable discharge-valve is connected to the lower end of the T.

A series of horizontal annular partitions m are disposed a short distance above one another within the tank, and with thewall of the tank and the screening member they form a series of stages in each of which the pulp passing through the tank receives an independent washing. These plates are of a width to extend from within contact with the interior of the tank to within close proximity to the screening-cylinder, the spaces between the inner edges of such partitions and the screening-cylinder being closed by flexible packingrings n, While each partition is provided with an opening 0, the openings of the series of partitions being set in different angular positions, and the corresponding side edge of each opening has a vertical partition 19, extending upwardly to the opposite side edge of the opening in the annular partition next above it. The lowermost annular partition is supported on a ring q, secured rigidly to the inside of the tank a short distance above the lower end of the screening-cylinder, and the other annular partitions are supported upon distance-pieces 7, each resting upon a partition and supporting the one next above it.

A series of doctors s are pivotally connected at one side edge to the annular partitions between which they extend, and a series of springs 25 yieldingly maintain these doctors in bearing relation with the screening-cylinder.

A series of perforated annular pipes u of preferably upwardly progressively decreasing capacity are located one in each stage, and they are of suflicient diameter to encircle the stage near the outer periphery thereof. These annular pipes are fed from a common feed-pipe o through a series of branches, each controlled by a valve w, and a series of nozzles y communicate at one end with the perforated pipes and are disposed to direct a jet diagonally upon the doctors to prevent the collection of pulp on the latter. The object of the diagonal arrangement of the jets is to cause it to agitate the thickened stock and accelerate the flow. An intake-pipe 2 for the pulp to be washed leads to the lowermost stage, and an exit-pipe 3 for the washed pulp leads from the topmost stage, the intake-pipe being controlled by a valve 4.

The branch pipes which connect the common water-feed pipe to the annular perforated pipes are connected to such annular perforated pipes by plug-joints 5 to allow the perforated pipe or sprinklers to be easily removed. A series of wedges 7 driven between the interior of the tank and the sides of the sprinklerpipes opposite to the common supply-pipe, keep the sprinkler-pipes in place, and the upper end of the driving-shaft is provided with a driving-pulley 10, and such shaft bears and is localized in a vertical opening or a bearingbox in a transverse girder 12, supported upon the top of the tank, while an oil-tray 13, located beneath the girder and encircling the shaft, prevents the drip of oil from the bearing-box or pulley reaching the washer.

The automatically-variable discharge-valve connected to the lower end of the T, as before mentioned, consists of a short sleeve 14, having a series of longitudinal valvular slots or ports 15, and a valve-disk 16 within this slotted sleeve is supported by an expansile helical spring 17, supported in turn upon a cap 18, closing the lower end of this sleeve.

The valve controlling the intake-pipe is opened and the pulp-ladened water is allowed to flood the tank. In so doing the pulp-ladened water must first fill the first stage and then rise through the opening in the first annular partition into the second stage, around which it is made to circle until it comes in contact with the vertical partition, when it will rise through the next opening to the third stage, and so on until it reaches the topmost stage. As it flows around each stage the water will flow through the screening-cylinder to the water-discharge pipe, which it.

floods, and simultaneously sufl icient fresh water will be sprayed into the stage to maintain the original or any desired consistency, thus causing a change of water in each stage, and consequently a progressive step-by-step washing of the pulp. As the washing-water flows from the different stages into the screeningcylinder the level in thelatter will gradually rise until it overflows the discharge end or mouth of the adjustable discharge-pipe. By adjusting this discharge-pipe to different angular positions the working head is varied, and the degree to which it is set is uniformly maintained bythe automatically-variable discharge-valve, which increases and diminishes its discharge capacity as the pressure due to the height of water in the screening-cylinder increases or diminishes relatively to the degree to which it is set.

My improved construction enables the screening-cylinder, which constitutes one of the walls of each stage, to be readily removed for repairs or cleaning.

The automatically-variable discharge-valve may be dispensed with under certain circumstances and the adjustable pipe alone used for the discharge, or vice versa, or the freshwater supplies partially or wholly cut off and the apparatus utilized as a condenser and other changes made in the precise arrangement or construction of the parts without departing from the spirit of my invention.

What 1 claim is as follows:

1. A pulp washer or condenser consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, means for rotating such screening member, a series of horizontal partitions dividing the space between such cylinders into a vertical series of stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a discharge-duct communicating with the interior of the screening member, a supply-duct for the pulp to be washed leading to the lower end of the tank, and a dischargepipe leading from the upper end of the tank.

2. In a pulp washer or condenser comprising a vertical series of washing stages and means for causing the pulp to be washed to flow through such stages from the bottommost to the topmost thereof, means for causing the pulp to be washed repeatedly when it flows through such stages, and means for adjusting the pressure in such pulp-washer.

3. In a pulp washer, or condenser means for adjusting the pressure of the washing fluid therein.

4. In a pulp washer or condenser, means forad usting the pressure of the washing fluid therein, and means for uniformly maintaining the pressure when adjusted.

5. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, a series of hori- Zontal partitions dividing the space between such cylinders into a vertical series of stages, means for effecting a communication between the stages ofsuch series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the interior of the screening member, a supply-duct for the pulp to be washed to the lower end of the tank, and a discharge-pipe leading from the upper end of the tank. 1

6. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screen- .ing member within said tank, a series of horizontal partitions dividing the spacebetween such cylinders into a vertical series of'stages, means for efiecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the interior of the screening member, such duct having its discharge end vertically adjustable, a supplyduct for the pulp to be washed leading to the lower end of the tank, and a discharge-pipe leading from the upper end of the tank. I

7. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, a series of horizontal partitions dividing the space'between such cylinders into a vertical seriesof stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the interior of the screening member, and having an automatically-variable valve controlling same, a supplyduct for the pulp to be washed leading to the lower end of the tank, and a discharge-pipe leading from the upperend of the tank.

8. A pulp-Washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, a series of hori- Zontal partitions dividing the space between such cylinders into-a vertical series of stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the lnterior of the screening member, and having an automatically-variable valve controlling same, such duct having its discharge end vertically adjustable,

a supply-duct for the pulp to be washed leading to the lower end of the tank, and a discharge-pipe leading from the upper end of the tank.

9. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, means for -rotating such screening member, a series of horizontal partitions'dividing the space between such cylinders into a vertical series of stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the interior of the screening member, such duct having its discharge end vertically adjustable, a supply duct for the pulp'to be washed leading to the lower end of the tank, and a discharge-pipe leading from the upper end of the tank.

10. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, means for ro-- tating such screening member, a series of horizontal partitions dividing the space between such cylinders into a vertical series of stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to'the next, a dischargeduct communicating with the interior of the screening member, and having an automatically-variable valve controlling same, a supplyduct for the pulp to be washed leading to the lower endof the tank, and a discharge-pipe leading from-the upper end of the tank.

11. A pulp-washer consisting of a vertical cylindrical tank, a vertical cylindrical screening member within said tank, means for rotating such screening member, a series of horizontal partitions dividing the space between v such cylinders into a vertical series of stages, means for effecting a communication between the stages of such series, means for causing the pulp to circle around each stage before passing therefrom to the next, a dischargeduct communicating with the interior of the screening member, and having an automatic-' all y-variable valve controlling same, such duct having its discharge end vertically adjustable,

'a supply-duct for the pulp to be washed leading to the lower end of the tank, and a discharge-pipe leading from the upper end of the tank.

12. In a pulp-washer the'combination with a rotary member of a doctor bearing upon such member and means directing a jet of water upon such doctor.

13. In a pulp-washer the combination with a tank and a rotary screening member therein of a series of doctors bearing upon such screening member and means directing a jet of water upon such doctors.

14. In a pulp-washer the combination with a tank and a rotary screening member therein ofa series of doctors bearing upon such screening member and means directing a jet of water diagonally upon such doctors.

15. In a pulp-washer the combination with a tank containing a washing fluid and a rotary screening member therein, of a doctor submerged in the washing fluid in said tank, and means for causing said doctor to bear upon the screening member.

16. In a pulp-washer the combination with a tank and a rotary screening member therein, of a series of doctors within said tank, and means for causing them to bear yieldingly upon the screening member.

17. In a pulp-washer the combination with a tank and a vertical cylindrical screening member therein and means whereby said screening member is rotated, of a series of horizontal partitions dividing the space between the screening member and the wall of the tank into a series of vertical stages, and a series of flexible packing-rings carried by such partitions and bearing upon the screening member.

18. In a pulp-washer, a vertical cylindrical screening member having an exhaust-passage leading from the interior thereof, and means for adjusting the resistance to the substance flowing through the said exhaust-passage.

19. In a pulp-washer, avertical cylindrical screening member having an exhaust-passage leading from the interior thereof, means for adjusting the resistance to the substance flowing through the said exhaust-passage, and means for maintaining the adjusted resistance.

20. In a pulp-washer, a vertical cylindrical screening member adapted to have a washing fluid flow therethrough, means for adjusting the resistance to the fluid flowing through the screening member, and means for maintaining the degree to which the resistance is adjusted.

21. In a pulp-washer the combination with a tank, of a hollow screening member within such tank, a series of partitions disposed a short distancefrom one another within the tank, each of such partitions having an opening and the openings of a series being disposed in different positions, an exhaust-passage leading from the interior of the screening member, an intake-pipe leading to one end of the washer and having a valve, and a discharge-pipe leading from the opposite end for the purpose set forth.

22. In a pulp-washer, the combination with a tank, of a hollow screening member within such tank, a series of partitions disposed a short distance from one another within the tank and means supplementing such partitions and closing the spaces between the interior of the tank and the exterior of the screening member, each of such horizontal partitions having an opening and the openings of the series being disposed in diflerent positions, a series of transverse partitions extending between the first-mentioned partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation. with the screening-cylinder, means for rotating one of said parts, the screening member or the series of doctors, relatively to the other, an exhaustpassage leading from the interior of the screening member, an intake-pipe leading to one end of the washer and having a valve, and a discharge-pipe leading from the opposite end for the purpose set forth.

23. In a pulp-washer the combination with a tank, ofa hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the partitions and closing the space between the interior of the tank and the exterior of the screening member, each of such annular partitions having an openingand the openings of the series being disposed in difi'erent angular positions, a series of partitions extending transversely to and between the first-mentioned partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of said parts, the screening member or the series of doctors, relatively to the other, means whereby the substance in the washer is agitated, an exhaust-passage leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

24. In a pulp-Washer the combination with a tank, of a vertical cylindrical screening member within such tank, aseries of annular partitions disposed a short distance above one another within the tank and means supplementing the plates and closing the spaces between the interior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular positions, a series of vertical partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, means for supporting such annular partitions, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screeningcylinder, means for rotating one of the said parts, which parts consist of the screening member and the series of doctors, relating to the other, an exhaust or discharge pipe leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

25. In a pulp-washer the combination with a tank, of avertical cylindrical screening member within such tank, a series of annular partitions disposed a short distance above one another within the tank and means supplementing the partitions and closing the spaces between the interior of the tank and the exterior I of the screening member, each of such annular partitions having an opening and the openings r of the series being disposed in different angular positions, a series of vertical partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a ring on the interior of the tank for supporting the lowermost annular partitions, and a series of distance-pieces supported by each horizontal portion and supporting the partition next above it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relating to the other, an exhaust or discharge pipe leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading gronti1 the uppermost stage for the purpose set ort 26. In a pulp-washer the combination with a tank, of a hollow screening'member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the partitions and closing the spaces between the interior .of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in difierent angular positions, a series of partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, a series of perforated annular pipes located one in each of the stages constituted by the annular partitions, the tank and the screening member, such annular pipes being of sufiicient diameter to encircle each stage near the outer periphery thereof, an exhaust or discharge pipe 7 leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve,

and a discharge-pipe leading from the uppermost stage for the purpose set forth.

27. In a pulp-washerthe combination with a tank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the parti- 8O tions and closing the spaces between the in-.

,terior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in difierent angu- 5 lar positions, a series of partitions extending. between the plates adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they. 9 are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, a series of perforated annular pipes located one in each of the stages constituted by the annular partitions, the tank and the screening member,

such annular pipes being of sufficient diameter to encircle each stage near the outer pe-i riphery thereof, a feed-pipe common to and feeding all the annular pipes of such series, a series ofvalves controlling the-communica tions between such common feed-pipe and the 5 annular pipes, an exhaust or discharge pipe leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve,

and a discharge-pipe leading from the upper. most stage for the purpose set forth.

28. In a pulp-washer the combination with a tank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within 1 I 5 the tank and means supplementing the parti tions and closing the spaces between the interior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of 1 the series being disposedin diflerentangular positions, a series of partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending 5 between the annular plates to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts I3 consist of the screening member and the series of doctors, relatively to the other, a series of perforated annular pipes located one in each of the stages constituted by the annular partitions, the tank and the screening member, such annular pipe being of suflicient diameter to encircle each stage near the outer periphery thereof, a series of devices causing jets to project from such annular pipes toward the doctors, a feed-pipe common to and feeding all the annular pipes of such series, a series of valves controlling the communications between such common feed pipe and the annular pipes, an exhaust or discharge pipe leading from the interior of the screening member, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

29. In a pulp-washer the combination with a tank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and of a width to extend from the interior of the tank to within close proximity to the screening member, a series of flexible packing-rings carried by the inner periphery of the annular partitions and bearing upon the screening member, each of such annular plates having an opening and the openings of the series being disposed in different angular positions, a series of partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with' the screening-cylinder, means i' or rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, an exhaust or discharge pipe leading from the interior of the screening member, an intakepipe leading to the lowermost stage of the Washer and having a valve, and a dischargepipe leading from the uppermost stage for the purpose set forth.

30. In a pulp-washer the combination with a tank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the partitions and closing the spaces between the interior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in diflerent angular positions, a series of partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screenihgcylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, an exhaust or discharge pipe leading from the interior of the screening member, such exhaust or discharge pipe being adjustable to locate its discharge end at diiferent heights, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

31. In a pulp-washer the combination with a tank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the partitions and closing the spaces between the interior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular positions, a series of partitions extending between the plates adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingl y maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, an exhaust or discharge pipe leading from the interior of the screening member, an automatically-variable valve controlling the said exhaust or discharge pipe, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

32. In a pulp-washer the combination with atank, of a hollow screening member within such tank, a series of annular partitions disposed a short distance from one another within the tank and means supplementing the partitions and closing the spaces between the interior of the tank and the exterior of the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular po sitions, a series of partitions extending between the partitions adjacent to the openings therein and dividing each opening from the one next to it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, means for rotating one of the said parts which parts consist of the screening member and the series of doctors, relatively to the other, an exhaust or discharge pipe leading from the interior of the screening member, such exhaust or discharge pipe being adjustable to locate -a vertical cylindrical tank, of avertical cylindrical screening member within such tank and having its upper and lower ends closed, the closed upper end having an opening therein, means whereby said screening member is rotated, a series of horizontal annular parti-" tions disposed a short distance above one another within the tank and of a width to extend from the interior of the tank to within close proximity to'the screening member, a series of flexible packing-rings carried by the inner periphery of the annular plates and bearing upon the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular positions, a series of vertical partitions extending between the horizontal partitions adjacent to the openings therein and dividing each opening from the one next to it, means for supporting such annular partitions, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yielding] y maintaining the doctors in bearing relation with the screening-cylinder, a series of perforated annular pipes located one in each of the stages constituted by the annular partitions, the tank and'the screening member, such annular pipes being of suificient diameter to encircle each stage near the outer periphery thereof, a series of nozzles projecting from such annular pipes toward the doctors, a feed-pipe common to and feeding all the annular pipes of such series, a series of valves controlling the communications between such common feed-pipe and the annular pipes, an exhaust or discharge pipe leading from the interior of the screening member, such exhaust or discharge pipe being adjustable to locate its discharge end at difierent heights, an automatically-variable valve controlling the said exhaust or discharge pipe, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

34. In a pulp-washer the combination with a vertical cylindrical tank, of-a vertical cylindrical screening member within such tank and having its upper and lower ends closed, the closed upper end havingan opening therein, means whereby said screening member is rotated, a series of horizontal partitions disposed a short distance above one another within the tank and of a width to extend from the interior of the tank to within close proximity to the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular-positions, a series of vertical partitions extending between the horizontal partitions adjacent to the openings therein and dividing each opening fromthe one next to it, means for supporting such annular partitions, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, a series of perforated annular pipes located one in each of the stages constituted'by the annular partitions, the tank and the screening member,

such annular pipes being of sufficient diameter to encircle each stage near the outer periphery thereof, a series of nozzles projecting from such annular pipe toward the doctors,

a feed-pipe common to and feeding all the annular pipes of such series, a series of valves controlling the communications between such common feed-pipe and theannular pipes, an

'exhaustor discharge pipe leading from the interior of the screening member such exhaust or discharge pipe be1ng ad ustable to locate its discharge end at diiferent heights,-

an automatically-variable valve controllingthe said exhaust or discharge pipe, anintakepipe leading to the lowermost stage of the 5 washer and having a valve, and a dischargepipe leading from the uppermost stage for the-- purpose set forth.

35. In a pulp-washer the combination with a tank, of ahollow screening member within such tank, means whereby said screening member is rotated, a series of annular partitions disposed a short distance above one another within the tank and of a width to extend from the interior of the tank to within close prox- 1o 5 imity to the screening member, a series of flexible packing-rings carried by the inner periphery of the annular partitions and bearing upon the screening member, each of such annular partitions having an opening and the no openings of the series being disposed in different angular positions, a series of vertical partitions extending between the partitions to the openings therein and dividing each open I ing from the one next to it, a ring on the in- I 15 terior of the tank for supporting the lowermost annular partitions, and a series 'ofdistance-pie'ces supported by each partition and supporting the plate next above it, a series of doctors extending between the annular par- 1 2o titions towhich they are pivotally connected,

a series'of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, a series of perforated annular pipes located one in each of the stages con-" 12 5 stituted by the annular partitions, the tank and the screening member, such annular pipes being of suflicient diameter to encircle each stage near the outer periphery thereof, a series of nozzles projectingfrom suchannular 3 pipes toward the doctors, a feed-pipe common to and feeding all the pipes of such series, a series of valves controlling the commumcations between such common feed-pipe and the annular pipes, an exhaust or discharge pipe leading from the interior of the screening member, such exhaust or discharge pipe being adjustable to locate its discharge end at different heights, an automatically-variable valve controlling the said exhaust or discharge pipe, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

36. In a pulp-washer the combination with a tank, of a vertical cylindrical screening member within such tank, means whereby said screening member is rotated, a series of annular partitions disposed a short distance above one another within the tank and of a width to extend from the interior of the tank to within close proximity to the screening member, a series of flexible packing-rings carried by the inner periphery of the annular partitions and bearing upon the screening member, each of such annular partitions having an opening and the openings of the series being disposed in different angular positions, a series of vertical partitions extending between the plates adjacent to the openings therein and dividing each opening from the one next to it, a ring on the interior of the tank for supporting the lowermost annular plate, and a series of distance-pieces supported by each plate and supporting the partitions next above it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, a series of perforated annular pipes located one in each of the stages constituted by the annular partitions, the tank and the screening member, such annular pipes being of sufiicient diameter to encircle each stage near the outer periphery thereof, a series of nozzles projecting from such annular pipes toward the doctors, a feedpipe common to and feeding all the annular pipes of such series, a series of valves controlling the communications between such common feed-pipe and the annular pipes, an exhaust or discharge pipe leading from the interior of the screening member, such exhaust or discharge pipe being adjustable to locate its discharge end at different heights, an automatically-variable valve controlling the said exhaust or discharge pipe, an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage for the purpose set forth.

37. In a pulp washer or condenser the combination with a vertical cylindrical tank, of a vertical cylindrical screening member within such tank, means whereby said screening member is rotated, a series of horizontal partitions disposed a short distance above one another within the tank and of a width to extend from the interior of the tank to within close proximity to the screening member, a series of flexible packing-rings carried by the inner peripheries of the horizonal annular partitions and bearing upon the screening member, each of such horizontal annular partitions having an opening and the openings of the series being disposed in different angular positions, a series of vertical partitions extending between the horizontal partitions adjacent to the openings therein and dividing each opening from the one next to it, a ring on the interior of the tank for supporting the lowermost annular partitions, and a series of distance-pieces supported by partitions and supporting the plate next above it, a series of doctors extending between the annular partitions to which they are pivotally connected, a series of springs yieldingly maintaining the doctors in bearing relation with the screening-cylinder, a series of perforated annular pipes of progressivelydecreasing capacity from the bottom to the top and located one in each of the stages constituted by the annular partitions the tank and the screening member, such annular pipes being of sufficient diameter to encircle each stage near the outer periphery thereof, a series of nozzles projecting from such annular pipes toward the doctors, a feed-pipe common to and feeding all the annular pipes of such series, a series of valves controlling the communications between such common feedpipe and the annular pipes, an exhaust leading from the interior of the screening member, such exhaust being adjustable to locate its discharge end at different heights, an automatically-variable valve controlling the said exhaust an intake-pipe leading to the lowermost stage of the washer and having a valve, and a discharge-pipe leading from the uppermost stage, for the purpose set forth.

38. In an apparatus for the treatment of pulp by a liquid, a member with which the pulp comes in contact and a doctor submerged in the liquid in the apparatus and adapted to remove the pulp from the side of such member with which the pulp first comes in contact.

In testimony whereof I have aflixed my signature in presence of two witnesses.

HORACE GREELEY TURNER.

Vitnesses:

l/VILLIAM P. MoFEA'r, FRED. J. SEARS.

lIO 

